EX-32.1 4 ex_816525.htm EXHIBIT 32.1

EXHIBIT 32.1

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Certification of Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

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CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

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In connection with the accompanying Quarterly Report on Form 10-Q of FS Bancorp, Inc. (the “Company”) for the quarter ended June 30, 2025 (the “Report”), I, Joseph C. Adams, in my capacity as Chief Executive Officer of the Company, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

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1. | The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

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2. | The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods presented in the financial statements included in the Report.

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Date: | August 8, 2025 | ​ | /s/Joseph C. Adams
​ | ​ | ​ | Joseph C. Adams
​ | ​ | ​ | Chief Executive Officer

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